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salad-
Go here and see what “Accept-Language” header is being sent in the request.
https://www.whatismybrowser.com/detect/what-http-headers-is-my-browser-sending
It should match Safari’s language, although I don’t know how monkeying with the app language changes that.
You might end up having to switch to a different browser that lets you set the language header explicitly.
grams
Sounds like you need a German VPN.
Sites will likely be using IP to resolve your location rather than any system setting.